I've just built my son a new system with almost the same components as yourself. I used an Althon II x4 630 (which has a very similar architecture as the Phenom but is a little cheaper).
I used a ASUS M4A77TD PRO 770 ($95 at Amazon.com) & a XFX Radeon HD 5750 ($140 at Amazon.com). We got a Samsung Spinpoint F1 1Tb HDD and used Windows 7 Professional as the OS.
The build went very easily with this motherboard, only the SATA / IDE slots slightly fouling each other.
We just benchmarked the system at the PassMark Software site, and it flies for the price, the DDR3 especially outstanding. Games like Crysis and Far Cry 2 play at maximum quality settings and large screen size at 40fps+.
My son is very impressed by the results, especially considering the price (he paid!!).